bug#43980: Update offlineimap to 7.3.3

[Efraim Flashner]

I changed python-rfc6555 to pull from the latest commit so it would
build with python3 also. The main thing was moving python2-selectors2 to
propagated-inputs so it gets carried along to the dependant
applications. With this I removed python2-selectors2 from inputs in
offlineimap.

I also added a copyright line for you in both files.

Thanks! Patches pushed.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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